Elsevier

Physics Letters B

Volume 749, 7 October 2015, Pages 14-34
Physics Letters B

Measurements of the ϒ(1S), ϒ(2S), and ϒ(3S) differential cross sections in pp collisions at s=7TeV

https://doi.org/10.1016/j.physletb.2015.07.037Get rights and content
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Abstract

Differential cross sections as a function of transverse momentum pT are presented for the production of ϒ(nS) (n = 1, 2, 3) states decaying into a pair of muons. Data corresponding to an integrated luminosity of 4.9fb1 in pp collisions at s=7TeV were collected with the CMS detector at the LHC. The analysis selects events with dimuon rapidity |y|<1.2 and dimuon transverse momentum in the range 10<pT<100GeV. The measurements show a transition from an exponential to a power-law behavior at pT20GeV for the three ϒ states. Above that transition, the ϒ(3S) spectrum is significantly harder than that of the ϒ(1S). The ratios of the ϒ(3S) and ϒ(2S) differential cross sections to the ϒ(1S) cross section show a rise as pT increases at low pT, then become flatter at higher pT.

Keywords

CMS
Upsilon
B-Physics
Cross section

Cited by (0)

1

Also at Vienna University of Technology, Vienna, Austria.

2

Also at CERN, European Organization for Nuclear Research, Geneva, Switzerland.

E-mail address: [email protected].